How to determine the location of a cat?

Question

Video capture

I want to detect a cat on the table) More precisely, its location, with further reprisals using an electronic device) Therefore, you need to select a sensor. What are the options?
There is an option to use a camera with post-processing, but I want something simpler. Is it possible to somehow use an infrared motion sensor (PIR)? Or hang some kind of tag on the collar in order to later detect in which direction the cat is?
The dimensions of the table are about 1 by 0.7 meters.

Answer 1

The specificity of the cat: If the owner of the house does not sleep, he does not climb on the table.
If the owner is not there, or is sleeping, he climbs onto the table, because. at this time the cat is the owner.
Moral: either close the room, or remove everything from the table, and do not mock the cat.